Update vold to log only debug or higher level messages.

This will allow adding lots of verbose logs which can be enabled
only during local testing/debugging. Update the existing verbose
level logs to debug level since we want those to be logged by
default.

Test: manual
Change-Id: Ib05e2b6efa71308458d49affb6ed81d3975b28ab
diff --git a/Devmapper.cpp b/Devmapper.cpp
index e5c7e37..b42467c 100644
--- a/Devmapper.cpp
+++ b/Devmapper.cpp
@@ -252,7 +252,7 @@
                 }
             }
         } else {
-            LOG(VERBOSE) << "Found unmanaged dm device named " << name;
+            LOG(DEBUG) << "Found unmanaged dm device named " << name;
         }
         nxt = n->next;
     } while (nxt);